Attachment for punching-machines



C. SUNELSUN.

ATTACHMENT FOR PUNCHING MACHINES.

APPLICATION FILED APR. 15, 1920.

1,371,324. Patented Mar. 15, 1921.

Z SHEETSSHEET lawman to:

Win-asses (L g W C. S. NELSON.

ATTACHMENT FOR PUNCHING MACHINES.

APPLICATION FILED APR. 15. 1920.

1,371,324. Patented Mar. 15, 1921.

2 SHEETS-SHEET 2.

g I anvenfoz UNITED STATES PATENT OFFICE.

ATTACHMENT FOR IUNGHING-MACHINES.

Specification of Letters Patent.

Patented Mar. 15, 1921.

Application filed April 15, 1920. Serial No. 374,213.

T (LN 10 item it may concern Be it known that 1, CHARLES SAMUEL NEL- SON, a subject of the King of Great Britain, and a resident of Quebec city, '11 the Province of Quebec and Dominion of Canada, have invented certain new and useful Improvements in Attachments for Punching- Machines, of which the following is a specification.

My invention an improvement in attachments for punching machines, and has for its object to provide an attachment of the character specified for permitting openings to be punched in work at predetermined points, without the necessity for laying off said openings with a templet or the like, wherein a carriage is provided having guided movement with respect to the punch, and having means for clamping the work to feed the same to the punch and having other means for engaging stops on the guidingmeans to properly position the work, the stop engaging means being movable into and out of operative position at will.

In the drawings:

Figure 1 is a front view of the attachment shown in connection with a punching machine;

Fig. 2 is an end view looking at the rear, d with the guide in section;

Fig. 3 is a view of the anvil showing a gage for positioning the work;

Fig. 4 is a top plan view of the anvil and the punch guide;

Fig. 5 is a plan view of the guide rail;

Fig. 6 is a side view of the guide for the stop plate;

Fig. 7 is a top plan view of the guide.

The present embodiment of the invention is shown in connection with a punching machine 1, having an anvil 2 and a punch guide 3, and the attachment comprises a T rail 1 which is connected at one end to the machine 1, by means of an angle bracket 5, as shown in Fig. 1.

Upon this rail there is mounted to move a carriage 5 consisting of a substantially channel shaped body having its side walls spaced apart a distance greater than the width of the base flange of the rail, and flanged wheels 6 are journaled on these side walls near the ends thereof, the said wheels being spaced to run with their body portions upon the base flanges of the rail and with their flanges at the outer edges of the said base flanges, as clearly shown in Fig. 2.

Thus the carriage has guided movement on the rail, the head of the rail being between the side walls of the channel shaped body.

At one end of the carriage there is provided a clamping device for the work. The said device comprises a clamping bar 8 which is supported on threaded stems 9 and 10, the bar having openings through which the stem extends. i

Lock nuts 11 are arranged above and below the bar on the stem 9, and lock nuts 12 and 13 are arranged on the stem above and below the bar, the lock nut 12 having radial arms let for convenience in turning the same. means of these lock nuts 11, 12 and 13 the bar may be moved into engagement with the work, and may be clamped between the carriage body and the bar, to properly hold the same during the punching thereof.

At the opposite end or" the carriage, that is. at the end remote from the punch, it being understood that the clamp is at the end adjacent the punch, there is provided a guide. This guide is angular in form, consisting of a portion 15 securely bolted to the body of the carriage and a portion 16 which 1 extends vertically at the end of the carriage. The portions 15 and 16 are connected on each side of their center by inclined webs 17 the said webs being spaced apart from each other a suflicient distance to receive an elbow lever l819 which is pivoted between them.

The arms 18 and 19 of the elbow lever ext-end at an acute angle with respect to each other, the arm 19 passing through a vertical slot 20 in the portion 16 of the guide, the said slot being between the webs 17. The arm 18 of the lever extends upwardly and outwardly away from the carriage, in convenient position to be grasped by the operator to move the stop plate 21 which is mounted to slide in the guide.

The portion 16 of the guide has ribs or flanges 22overlying the face of the portion in spaced relation, and forming guides for the plate 21 which are slidable in the guides. This plate has an opening 23, as shown in Fig. 2, for receiving the arm 19 of the operating lever, and, referring to Figs. 1 and 6, it will be noticed that the guide ribs or flanges 22 are extended below the portion 15 of the guide.

The rail 1 is provided in the head or tread thereof with a series of transverse notches or recesses 24 and at the bottom of each recess and at the center thereof there is an opening 25. These notches are adapted to receive stop blocks 26 which have a width approximately equal to that of the head of the rail, and each block has a depending pin 27, shown in Fig. 2, for engaging the opening 25 of the notch or recess in which the stop block is placed.

Set screws 28 are threaded through the stop blocks at the top thereof and these screws 28 are adapted to be engaged by the stop'plate 21 to check the carriage at the proper position for the punchmg oi'f the work. he stop blocks may be straight, as shown at 26 in Fig. 1, or they'may be angular as shown at 29 in the said figure, or they may be or any other shape desired.

In operation, the templet is held in the clamping device at the right end of the carriage, between'the carriage and the bar 8. The carriage is then run along the rail and the stop blocks 26 and 29 are placed in such position that when the stop plate 21 abuts a screw a templet opening will be at the punch. The stops are placed to suit the openings of the templet. After the stops have been placed the templet is released and the work is grasped in the same manner.

When now the carriage is run along the rail, whenever the stop plate abuts a screw,

the punch is operated to punch an opening. As soon as the opening has been punched the lever 18 is operated to raise the stop plate, when the carriage may pass over the block; The stop plate is immediately dropped and when it engages a stop block another opening is punched.

Even in small items of work there is economy in using the spacer. For instance, for ten angles or plates the spacer may be set up and the plates punched in a shorter space of time than with the use of the templet to lay off the work. Holes may be punched from one and a half inch center up to any distance. 7

The rail 4 is a standard sixty pounds to the yard rail and the notches or recesses 24 in the rail are machined to the same size. lVith the improved attachment the punching is absolutely accurate, corresponding always to the templet by which the stop blocks have been set.

' In Fig. 3 there is shown a gage for properly positioning the Work indicated at 30. This gage is a screw 31 which is threaded through a bracket lug 32 secured to the frame 1 of the punching machine by means of screw bolts 33, as shown. A look nut 34 is arranged on the screw. When the work 30 is laid upon the anvil the edge of the work engages the screw 31 which is set to the proper point. thus furnishing a gage for the correct positioning of the work during the punching.

I claim:

1. In combination with a punching machine, of an attachment comprising a T rail guide extending laterally from the machine, a carriage having wheels running upon the base flanges of the rail, a clamping device at that end of the carriage adjacent to the punch for clamping the work, and a vertically movable manually controlled stop plate at the other end of the carriage movable toward and from the head of the T rail, said T rail having stops for engagement by the stop plate, the rail having transverse notches .or recesses and the stops comprising blocks fitting the recesses, and having set screws threaded through said blocks for engagement by the stop plate} 2. In combination with a punching machine, of an attachment comprising a T rail guide extending laterally from the machine, a carriage having wheels running upon the base flanges of the rail, a clamping device at that end of the carriage adjacent to the punch for clamping the work, and a vertically movable manually controlled stop plate at the other end of the carriage movable toward and from the head of the T rail, said T rail having stops for engagement by the stop plate, the rail having transverse notches or recesses and the stops comprising blocks fitting the recesses.

3. In combination with a punching machine, of an attachment comprising a T rail guide extending laterally from the machine,

a carriage having wheels running upon the base flanges of the rail, a clamping device at that end of the carriage adjacent to the punch for clamping the work, and a vertically movable manually controlled stop plate at the other end of the carriage movable toward and from the head of the T rail, said T rail having stops for engagement by the stop plate.

4. An attachment for punching machines comprising a guide adapted to extend laterally from the machine and having notches at regular intervals, a carriage for the work mounted to move on the guide and having a vertically movable stop, and a series of stops for seating in the notches of the guide and adapted to be engaged by the stop of the carriage, set screws threaded through sundry of the stops for permitting a fine adjustment.

5. An attachment for punching machines comprising a guide adapted to extend laterally from the machine and having notches at regular intervals, a carriage for the work cHARL s SAMUEL NELSON. 

